Wijaya, Dewi, Rohani Lasmaria, and Alven Edra. 2022. “Bacterial Sputum Culture Results With Moderate and Severity Covid-19 Patients in Pinere Room Arifin Achmad Hospital, Riau Province”. Nusantara Science and Technology Proceedings, December. Malang, Indonesia, 82-85. https://doi.org/10.11594/nstp.2022.2816.